土工基础

›› 2017, Vol. 31 ›› Issue (6): 758-761.

• 工程实录 • 上一篇    下一篇

不同冲击荷载作用下软黏土真三轴试验研究

康文武   

  1. （广东工业大学岩土工程研究所，广州 510006）
  • 收稿日期:2016-12-13 修回日期:2016-12-20 出版日期:2017-12-20 发布日期:2017-12-27
  • 作者简介:康文武（1990-），男，硕士研究生，主要研究方向为地基与基础工程等。
  • 基金资助:

    广东省自然科学基金资助项目(No.2016A030313692)

Triaxial Test of the Dynamic Response of Soft Clay Samples under Various Impact Loads

KANG Wenwu   

  1. (Institute of Geotechnical Engineering, Guangdong University of Technology, Guangzhou 510006)
  • Received:2016-12-13 Revised:2016-12-20 Online:2017-12-20 Published:2017-12-27

摘要： 采用SPAX-2000改进型静动真三轴测试系统，对典型的饱和软黏土试样（含水量50%～68%）进行了不同固结围压（100 kPa、150 kPa、200 kPa）和不同冲击荷载频率（1 Hz、5 Hz、10 Hz）下的三轴冲击试验和不排水剪切试验，研究了不同条件下软黏土的力学响应和强度特性。试验结果表明：冲击固结阶段，在相同围压、不同冲击荷载频率下，试样的偏应力峰值和轴向应变均随着荷载频率的增大而减小；在相同冲击荷载频率、不同围压下，偏应力峰值随着围压的增大而增大，轴向应变随着固结围压的增大而减小；根据测试数据，建立了适用于软黏土的变形模量增加率与冲击次数的经验关系，并给出了适用条件。

关键词: 软黏土, 三轴试验, 荷载频率, 固结围压, 变形模量

Abstract: This paper presents the laboratory test results of the dynamic response of soft clay samples under dynamic load and undrained conditions by the improved static and dynamic true triaxial test system SPAX2000. The typical soft clay samples (moisture contents between 50% and 68%) were under various cell confining pressures (100 kPa, 150kPa and 200 kPa) and tested with different loading frequencies (1 Hz, 5 Hz and 10 Hz). The following conclusions can be obtained: within the shock loading consolidation stage, under the same cell confining pressure and different loading frequencies, the peak value of the deviator stress and the axial strain decrease with the increase of loading frequency; under the same loading frequency and different cell confining pressures, the peak value of deviator stress increases with the cell confining pressure; and the axial strain decreases with the cell confining pressure. The relationship between the rate of the deformation modulus increase and the number of dynamic loading are established from the test results. The application range of this empirical relationship is also provided in the paper.

Key words: Soft Slay;Triaxial Test;Loading Frequency, Confining Pressure, Deformation Modulus